Tech Tip: The Truth Behind EMGO Petcocks
The EMGO motorcycle brand is a leading and popular parts manufacture within our classic British industry
With EMGOs huge manufacturing facility located in Taiwan, EMGO supplies gas tanks, gasket sets, tail lights, petcocks and everything else in between for our traditional Triumph, BSA and Norton motorcycles
Today, we will be covering the topic of petcocks and why we believe that EMGO petcocks are the best petcocks on the market should your tank accept a 1/4" BSPP (British Standard Pipe Parallel) valve
Lets dive in...
Lets take a trip back in time to the early 2000's
EMGO has been supplying classic British motorcycle petcocks for over 20 years, however, there petcocks didn't always receive a "positive praise"
The older style EMGO petcocks would leak and break down in a short period of time causing gas leaks, sealing issues and "hard to turn levers" that would eventually break off
We even experienced those issues here some time ago which left a bade taste in our customers mouths and even ours
You might even hear some folks say "stay away from EMGO petcocks"
Although they did have a point years ago, I can safe with confidence that opinions and quality have changed since then
The problem (then)
So what caused the EMGO petcocks to leak and break down?
It was simple, it turned out to be the internal parts that were not compatible with the modern fuel
It had nothing to do with the brand or quality, just simply incorrect components for the specific job
Luckily, EMGO listened to the problem and came up with a simple and effective solution that is now implemented on all EMGO British motorcycle petcocks that we stock and that are on the market with other vendors
Keep reading to find out how EMGO made a better petcock..
EMGO petcock tear-down
There are 2 major design benefits of the "updated" EMGO petcock that make them pretty dam good and reliable in which we will cover below using an "off the shelf" EMGO petcock
First lets cover the internal parts followed by the removable filters
Internal metal parts
The solution that EMGO came up with to fix leaky petcock valves and "hard to turn levers" was by simply changing the components internally
That consisted of metal internal parts instead of plastic parts that would dry and crack which would cause leaks...
Having metal internal parts would also work with the changing fuel blends that are at your local pumps
This new "updated" design is in fact nothing new, and was implemented around 2010 or so and the same process is still being used today
Unlike some of the leading brand petcocks (and original petcocks) on the market, the EMGO petcocks give you an option to remove the fuel filter should they need to be cleaned or replaced
The filter features bottom threads while the petcock features internal threads that allow this to be done
Most of my Triumph's, and some BSA models that have been converted over to the 1/4" BSPP petcocks are running exclusively EMGO petcocks
My 1968 Triumph TR6R has the "updated" EMGO petcocks which I installed back in 2014 and they do not leak, weep or seep
In fact, the levers are still smooth and easy to operate to this day (even when the bike sits)
Most of our customers that have installed EMGO petcocks have been happy with the quality and price point
So from reading above, you heard me throw out the term "1/4 BSPP" a lot
EMGO only makes petcocks that are 1/4" BSPP for our British bikes, however, not all tanks and British bikes can accept a 1/4" BSPP petcock...
1/4" BSPP petcocks are popular on most Triumph applications, and some BSA and Norton (also others)..
1/4" BSPP has a thread O.D. of approx .509" with a thread pitch of 19 (straight threads)
Should your tank accept that size petcock, checkout our current EMGO petcock selection by viewing the chart below
|Petcock type||Specs||Part #||Link|
|Lever Type||1/4" BSPP X 19||83-2800||Click Here|
|Lever Type||1/4" BSPP X 19||83-2801||Click Here|
|Lever Type W/ Flag||1/4" BSPP X 19||60-4511||Click Here|
|Lever Type W/ Flag||1/4" BSPP X 19||60-4512||Click Here|
|Sealing Washer Pack||Dowty Type||70-7351 & 83-0002||Click Here|
|Replaceable Fuel Filter||EMGO Petcocks Only||Click Here|
BSA "Ewarts Petcock Conversion"
Although this quick paragraph is slightly off topic, I thought now would be a good time to cover our adapters
BSA (and some Triumph) models that where fitted with the push & pull / pull & turn Ewarts petcocks with a spec of 3/8" BSPP can now use the EMGO "flag type" petcocks like shown above if you use our special adapters
This "conversion" will allow you to use an EMGO petcock instead of the older Ewarts (cork) petcocks that will eventually leak and fail
All my BSA singles & twins here at the shop get this "conversion" for practicality reasons
Should you be interested in an adapter for your tank, please see the chart below
|Petcock Adapter||1/4" BSPP To 3/8" BSPP||Click Here|
|Sealing Washer Pack (Recommended)||Dowty Type||Click Here|
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